Finding the Fourth Proportional to 290,196.81, 400,465.96 and 161,128.61

Step by Step Solution

1. Step 1: Write the proportion equation
   290,196.81 : 400,465.96 = 161,128.61 : x
2. Step 2: Convert to fraction form
   290,196.81/400,465.96 = 161,128.61/x
3. Step 3: Cross multiply
   290,196.81x = 400,465.96 × 161,128.61
4. Step 4: Simplify right side
   290,196.81x = 64,526,522,583.71
5. Step 5: Solve for x
   x = 64,526,522,583.71/290,196.81
6. Step 6: Final answer
   x = 222,354.35